gnome-sharp-2.20.0-2 does not provide vte-sharp.dll found in /usr/lib/mono/gtk-sharp-2.0/ gnome-sharp did provide this file in fedora 9, so I'm suspecting there may just be a problem with this build.
assembly vte-sharp.dll is now provided by package *gnome-desktop-sharp*. It is not the case on F-9 for now due to important break dependencies that gnome-sharp-2.20.0 will does against mono related packages.